B1249 Double door lock ECU Communication stops

DESCRIPTION

1. This DTC is detected when communication between the double door lock ECU (Double Locking ECU) and multiplex network gateway ECU stops for more than 10 seconds.
   

DTC No.	DTC Detection Condition	Trouble Area
B1249	Double door lock ECU Communication stops	Double door lock ECU Wire harness

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1249, repair the "+B or GND short malfunction of communication bus" DTCs first.

1. INSPECT FUSE (DOOR No.2)

1. Remove the DOOR No.2 fuse from the instrument panel junction block.

2. Measure the resistance of the fuse.

   Standard resistance:

   Below 1 Ω
   

NG	REPLACE FUSE

OK

2. CHECK WIRE HARNESS (DOUBLE DOOR LOCK ECU - BATTERY AND BODY GROUND)

1. Disconnect the D2 ECU connector.

2. Measure the voltage of the wire harness side connector.

   Standard voltage:

   Tester Connection	Specified Condition
   D2-1 (+B) - Body ground	10 to 14 V

3. Measure the resistance of the wire harness side connector.

   Standard resistance:

   Tester Connection	Specified Condition
   D2-14 (GND) - Body ground	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3. CHECK RESISTANCE OF COMMUNICATION LINE

1. Disconnect the P19 and G1 ECU connectors (w/o Driving position memory).

2. Disconnect the P19 and T4 ECU connectors (w/ Driving position memory).
   

3. Measure the resistance of the wire harness side connectors.
   

   Standard resistance:

   Tester Connection	Specified Condition
   D2-9 (MPX1) - P19-7 (MPX1)	Below 1 Ω
   D2-9 (MPX1) - G1-12 (MPD2) (*2)	Below 1 Ω
   D2-9 (MPX1) - T4-5 (MPX1) (*1)	Below 1 Ω

   *1: w/ Driving position memory*2: w/o Driving position memory

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE DOUBLE DOOR LOCK ECU